Use an apple corer or melon baller to remove the apple's core. Cut half an inch off the top and bottom of the apple. Cut apple crosswise into four 1/2-inch-thick slices. They will look like bagels with holes in the center. Rub the cut side of the lemon over both sides of the apple slices to keep them from browning. Spread peanut butter on two of the apple slices. Sprinkle granola over the peanut butter. Top with remaining apple slices.

Thread a cherry tomato onto a skewer followed by a piece of basil, a mozzarella ball, and a bread cube. Repeat so the skewer has two of every item. Add a third cherry tomato on the end of each skewer. Snap off the pointed ends of the skewers and discard. Repeat with remaining ingredients. Serve with a side of olive oil and balsamic vinegar for dipping.